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X-ray diffraction and microstructural studies in 2 : 17 type Sm–Co magnetic alloys containing Fe, Cu, and Zr

Published online by Cambridge University Press:  31 January 2011

R. Gopalan ,
T. S. R. K. Sastry ,
A. K. Singh  and
V. Chandrasekaran
R. Gopalan
Affiliation:
Defence Metallurgical Research Laboratory, Hyderabad-500 058, India
T. S. R. K. Sastry
Affiliation:
Defence Metallurgical Research Laboratory, Hyderabad-500 058, India
A. K. Singh
Affiliation:
Defence Metallurgical Research Laboratory, Hyderabad-500 058, India
V. Chandrasekaran
Affiliation:
Defence Metallurgical Research Laboratory, Hyderabad-500 058, India
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Abstract

X-ray diffraction and microstructural studies were carried out on 2 : 17 type Sm–Co alloys containing Fe, Cu, and Zr (13–14 at.% Sm, 57–60 at.% Co, 20–22 at.% Fe, 4 at.% Cu, and 3 at.% Zr) in as-cast and heat-treated conditions. Microstructural studies revealed that the as-cast alloys contain three phases. It was observed that the samples subjected to sintering at 1463 K for 45 min followed by a solution treatment at 1448 K for 1 h resulted in nearly a single-phase, rhombohedral crystal structure (Th2Zn17-type). Subsequent isothermal aging at 1123 K and ramp-cooling to 673 K resulted in a mixture of Sm2Co17- and SmCo5-type phases with the former as major phase. It was also found that samples (Sm > 13 at.%) sintered at temperatures >1463 K showed incipient melting and multiphase formation.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 6 , June 1999 , pp. 2430 - 2435
Copyright
Copyright © Materials Research Society 1999

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